Match grading RED and 5D in Nuke

I’m trying to match two images shot with a Canon 5D and a Red One (MX sensor). Both are "developed" with a linear curve and given to me as EXRs (they are correctly developed and rendered, in RedCineX and Camera Raw). Still, just using the exposure tool, I’m not able to get them to match. I would guess becuse of the sensors not being truly linear. I can’t do a shot by shot color matching, as I have a big project where I will have hundreds of images that needs to be matched. My thought is that I would match grade them once, create a gizmo, and then I will only need to adjust the exposure on each shot in order to get them to match. Both cameras will shoot in the same studio in the same lighting conditions. I have color charts as well as .18% grey cards shot by both cameras in the same position and in the same lighting setup.

I tried to use the grade tool and follow the method shown in one of the videos on The Foundrey’s site, but without any succes. Any tips how this could be achived?

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